So far, I can't find anything I don't like. In fact, I love it. This thing is incredible. Not much else to say yet until I take it out... I am doing the Clear Lake wildlife refuge at 5am tomorrow, and probably Fish Springs wildlife refuge, both here in Utah. I'll probably use that lens exclusively most of the day.
The push/pull zoom doesn't bother me at all. And, this isn't hardly heavy at all either, I can handhold it easily, especially with the IS activated.
I am fired up, this is gonna be a fun lens. It's just so lonely without it's wife, the 70-200....